Upgraded Q -> H from 211 [1667662048262]

[code423n4]

Judge has assessed an item in Issue #211 as High risk. The relevant finding follows:

[HickupHH3]

When block.timestamp = epochEnd, both triggerDepeg and triggerEndEpoch is potentially callable, because the functions require that the timestamp is <= or >=, respectively. When the depeg happens exactly at this timestamp, there is a huge incentive for capital providers to call triggerEndEpoch, whereas the insured persons want to call triggerDepeg. It is recommended to change one of the functions to enforce a strict inequality to avoid such situations where frontrunning can be very profitable.

dup of #69